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My New Laptop Battery
I just received a new PA33838U-1BRS (?12 cell I think) battery I
bought from batterydepot.com and I am surprised that it has so short a life in my Toshiba A75-S209 laptop. I should say for the record that the battery arrived fully discharged, dead as could be. That surprised me too. But then I know nothing about Lithium ION batteries, so I am not sure what to expect. I have read the info at http://batteryuniversity.com/learn/a..._ion_batteries As I watch Toshiba's Power Meter, with the desktop displayed, but the laptop sitting idle otherwise, the capacity has decreased from 97% to 50%. That says to me that I will get only two hours out of a full battery charge. Is that normal, good, bad, or what? I also wonder why an overnight full charge (laptop off) only charged the battery to 98%. So - I have to ask. Is something wrong? What is normal? Thank you |
#2
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My New Laptop Battery
In ,
aaaaa typed: I just received a new PA33838U-1BRS (?12 cell I think) battery I bought from batterydepot.com and I am surprised that it has so short a life in my Toshiba A75-S209 laptop. I should say for the record that the battery arrived fully discharged, dead as could be. That surprised me too. But then I know nothing about Lithium ION batteries, so I am not sure what to expect. I have read the info at http://batteryuniversity.com/learn/a..._ion_batteries As I watch Toshiba's Power Meter, with the desktop displayed, but the laptop sitting idle otherwise, the capacity has decreased from 97% to 50%. That says to me that I will get only two hours out of a full battery charge. Is that normal, good, bad, or what? I also wonder why an overnight full charge (laptop off) only charged the battery to 98%. So - I have to ask. Is something wrong? What is normal? Thank you Sounds "normal" to me. I don't think the battery should have been dead, but I'm not certain. How did you determine it was "dead"? The 98% might have been "normal" too as their hold-voltage is slightly less than the max voltage of other types of batteries. Here are some links that may be helpful: Lithium-ion is different from other batteries as you'll see: http://batteryuniversity.com/index.p..._ion_batteries http://en.wikipedia.org/wiki/Lithium-ion_battery the latest lithium ion battery technology which has no memory problems, so there is no need to fully discharge them light before use. The above caught my eye and seems to indicate that shipping the batteries "dead" might be OK. Luck, Twayne` |
#3
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My New Laptop Battery
"aaaaa" wrote in message ... I just received a new PA33838U-1BRS (?12 cell I think) battery I bought from batterydepot.com and I am surprised that it has so short a life in my Toshiba A75-S209 laptop. I should say for the record that the battery arrived fully discharged, dead as could be. That surprised me too. But then I know nothing about Lithium ION batteries, so I am not sure what to expect. I have read the info at http://batteryuniversity.com/learn/a..._ion_batteries As I watch Toshiba's Power Meter, with the desktop displayed, but the laptop sitting idle otherwise, the capacity has decreased from 97% to 50%. That says to me that I will get only two hours out of a full battery charge. Is that normal, good, bad, or what? I also wonder why an overnight full charge (laptop off) only charged the battery to 98%. So - I have to ask. Is something wrong? What is normal? Thank you If the battery is new, and doesn't even provide the length of runtime the old battery does, then there is a) either something wrong with the new battery, or b) it's nowhere near the mAh rating of the old one. In the case of 'a', send it back; in the case of 'b', you're probably SOL unless battery depot will strike a deal with you. Note: every new battery that I have ever had say to charge it at least overnight before running on it. -- SC Tom -There's no such thing as TMI when asking for tech support. |
#4
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My New Laptop Battery
SC Tom wrote:
"aaaaa" wrote in message ... I just received a new PA33838U-1BRS (?12 cell I think) battery I bought from batterydepot.com and I am surprised that it has so short a life in my Toshiba A75-S209 laptop. I should say for the record that the battery arrived fully discharged, dead as could be. That surprised me too. But then I know nothing about Lithium ION batteries, so I am not sure what to expect. I have read the info at http://batteryuniversity.com/learn/a..._ion_batteries As I watch Toshiba's Power Meter, with the desktop displayed, but the laptop sitting idle otherwise, the capacity has decreased from 97% to 50%. That says to me that I will get only two hours out of a full battery charge. Is that normal, good, bad, or what? I also wonder why an overnight full charge (laptop off) only charged the battery to 98%. So - I have to ask. Is something wrong? What is normal? Thank you If the battery is new, and doesn't even provide the length of runtime the old battery does, then there is a) either something wrong with the new battery, or b) it's nowhere near the mAh rating of the old one. In the case of 'a', send it back; in the case of 'b', you're probably SOL unless battery depot will strike a deal with you. Note: every new battery that I have ever had say to charge it at least overnight before running on it. You can't expect anything until you charge it fully, run it down till it shuts off, recharge it without interruption. That's supposed to calibrate the battery meter, but sometimes it takes more cycles. Some vendors supply an app for this. Read the manual. The only real measure of how long it will run is to time how long it runs. The worse the battery, the less accurate the prediction. The most annoying characteristic is that for bad batteries, the meter initially drops slowly, then the system abruptly shuts off. Another annoying issue is the AGE of the battery. Don't know how old your laptop is, but I use laptops from 2005. Any random "new" battery I buy may have been sitting in a container in the sun in Arizona for 5 years. They can have significant age issues even though they've never been used. |
#5
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My New Laptop Battery
aaaaa wrote:
I just received a new PA33838U-1BRS (?12 cell I think) battery I bought from batterydepot.com and I am surprised that it has so short a life in my Toshiba A75-S209 laptop. I should say for the record that the battery arrived fully discharged, dead as could be. That surprised me too. But then I know nothing about Lithium ION batteries, so I am not sure what to expect. I have read the info at http://batteryuniversity.com/learn/a..._ion_batteries As I watch Toshiba's Power Meter, with the desktop displayed, but the laptop sitting idle otherwise, the capacity has decreased from 97% to 50%. That says to me that I will get only two hours out of a full battery charge. Is that normal, good, bad, or what? I also wonder why an overnight full charge (laptop off) only charged the battery to 98%. So - I have to ask. Is something wrong? What is normal? Thank you Those particular kind of batteries, are like "tomatoes". You have to buy them "fresh". Check to see if there is a manufacture date on the battery, to get some idea how old the stock is. It might be as old as the original battery for example. The battery ages, even in storage. They only last a limited period of time. In fact, it probably doesn't matter how many times you charge and discharge that battery, as it'll wear out on a time basis anyway. When you buy one, you might as well use it. It can't be preserved in any practical way. So buying two of them, on the premise you'll use them serially, is a mistake (i.e. start using the second one, when the first wears out, the second one won't have much life left in it). The Battery University may claim it lasts the longest in storage, at 40% charge. If you received your new battery completely flat, the charger circuit may have refused to charge it. It may have had some residual voltage on it, and not been completely flat (zero volts). You'd need to search for battery life reports for your model of laptops, under identical conditions. If you Google and someone has said in the past "my Toshiba XYZ will run for 3 hours idle in the desktop", that would give you a metric for comparison. Otherwise, it's pretty hard for someone who doesn't own such a laptop, to judge. My new laptop, lasts maybe 2.5 hours on battery. It has a 25W processor, a single core, so should be easy on the battery. There are no fancy graphics, only the GPU in the Northbridge. And my battery is small. It's not an extended runtime battery. Some other kinds of (gutless) portable computing products, get ten hours off a single charge. That's sort of the upper range for portable equipment. A "desktop replacement" laptop, one with fancy gaming graphics chip, might only get 30 minutes from battery, due to the heavy electrical load. Such computers are not really intended for "off tether" operation - they're really intended to be operated from the mains at all times. The battery in that case, functions more as a UPS, providing power to cover short outages if they occur. You couldn't really do very much, with a 30 minute battery life (like watch a DVD movie on the plane). Paul |
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